Background and Aim: Color match between prosthetic restorations and natural teeth is challenging in dentistry. The aim of the current study was to assess the effect of accelerated aging on color stability of two silica-based ceramics with leucite and lithium disilicate crystalline phases after glazing and polishing surface treatments. Materials and Methods: In this experimental study, 30 disc-...

Abstract: Cold working performed before an aging treatment has a significant effect on size and amount of precipitate produced. This could be caused by the increase in defect density, such as vacancies and dislocations. In this research, the Al-Cu-Si alloy was solution-treated, wear-tested and then artificially aged for a period of 1–5 h. Changes in the amount of precipitate, in the lattice par...

Pluripotent stem cells have the remarkable self-renewal ability and are capable of differentiating into multiple diverse cells. There is increasing evidence that the aging process can have adverse effects on stem cells. As stem cells age, their renewal ability deteriorates and their ability to differentiate into the various cell types is altered. Accordingly, it is suggested aging-induced deter...

BACKGROUND Regularity effect can affect performance in prospective memory (PM), but little is known on the cognitive processes linked to this effect. Moreover, its impacts with regard to aging remain unknown. To our knowledge, this study is the first to examine regularity effect in PM in a lifespan perspective, with a sample of young, intermediate, and older adults. OBJECTIVE AND DESIGN Our s...

BACKGROUND Aging can cause loss of balance, which may lead to physical and psychological problems. As the role of the otolith organs in maintaining postural stability has been emphasized in recent years, the present study investigated the effect of aging on saccular function using cervical vestibular evoked myogenic potentials (cVEMP). METHODS The participants were assigned into two groups; g...

The effects of aging upon lipid metabolism were analysed on the facts obtained by epidemiological and experimental studies. The meann cholosterol and triglyceride concentrations increased with age up to the age of 55, then gradually fell as age advanced. Between the subjects grouped by the age under 50 and over 60 years, no difference was seen in the response of blood glucose, FFA, and IRI to o...

PURPOSE This study was designed to evaluate the minimum interocular correlation (IOC) needed by the visual system to correctly perceive a static stereoscopic stimulus as a function of normal aging. It was also our goal to evaluate the feasibility of clinical charts testing this aspect of visual perception. METHODS Stereoscopic IOC threshold was determined in 100 normal observers (average age ...

[Purpose] The purpose of this study was to investigate the effect of aging on respiratory synergy, through the comparison of an elderly group and a young group, to help further understanding of postural control in the elderly. [Subjects and Methods] Ten community-dwelling elderly subjects and ten young subjects performed standing under two different respiratory conditions: quiet breathing and a...

The ability to inhibit the processing of irrelevant information declines as adults age (Hasher & Zacks, 1988; Lustig, Hasher and Tonev, 2006; Mayr, 2001). However, previous research investigating inhibitory control in older adults has not evaluated the extent to which irrelevant information is processed and later recognized. Using a dual task paradigm with young adults, Dewald, Sinnett, and Dou...